Incandescent electric lamp



(No Model.)

R. GREER.

INGANDESGENT ELECTRIC LAMP. No. 541,929. Patented July 2, 1895.

UNITED STATES PATENT OFFICE.

ROBERT GREER, OF INESTBROOK, MAINE.

INCANDESCENT ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 541,929, dated July 2,1895.

Application fil d November 10, 1894 Serial No. 528,864. (No model.)

to all whom it may concern:

Be it known that I, ROBERT GREER, residing at Vestbrook, in the countyof Cumberland and State of Maine, have invented certain Improvements inIncandescent Electric Lamps, of which the following is a specification.

This invention relates to incandescent electriolamps and especially tothat form denominated stopper or plug lamps in which the filament andits support are separable from the glass bulb, and to a method ofconstructing such lamps simply and cheaply.

In carrying out my invention I make the glass bulb of the lamp completewith its upper end sealed and its lower end open. I attach the filamentto a suitable supportin such a manner that its terminals form suitablecontacts to engage with the terminals of the electric mains in the lampsocket. The base of the said support fits into the lower end of theglass bulb and is encircled With a band of elastic sealing material. Iprovide a receiver with suitable connection to an air exhausting pump,and with an openingin its side through which the glass bulb is inserted,and means within the receiver for holding the bulb. In connection withthe receiver there is a sliding rod or piston one end of which is withinthe receiver and which is provided with means for holding the filamentand its support. The method consists in placing the glass bulb withinthe receiver through the said opening and then closing the same, thenexhausting the air from the receiver, and necessarily also from theglass bulb, and then sliding the said rod or piston with the saidfilament and support, upon its end to the opening in the bulb, andpressing the said support or plug into the bulb opening. The air is nowadmitted to the receiver, which pressing upon the exterior of the plugand bulb tends to keep them together, the elastic band preventing theair from entering the bulb and sealing the joint.

The invention also consists in the means described for connecting thefilament contacts with the terminals of the electric mains, all of whichI will now proceed to describe and point out in the claims.

In the drawings, Figure 1 represents a view in elevation partly insection, with the plug partly withdrawn, of an electricincandescent lampembodying my invention. Figs. 2 and 3 are details of the same, and Fig.4illustrates the method of assembling or making the incandescent lampdevised by me.

a is the glass bulb made as shown, sealed at the top and open at thebottom. The opening 1) is a straight smooth cylinder.

B represents the plug or stopper and consists of a. hollow cylinder ofglass provided with a flange or baseffroni the inner face orcircumference of which the lugs e' 2' project. The filament c isconnected to the wires 2 2 sealed in the upper part cl of the plug,which are connected to the wires 1,1, the ends of which are wound aroundthe lugs 2', i, and soldered. These soldered ends are the contacts whichconnect with the electric mains which furnish the current to the lamp.The part 6 of the plug is made to fit snugly into the cylindricalopening I) of the bulb a and may be ground therein.

9 is a ring or band which rests upon the top of the base or flangef andmaybe of any suit able elastic material, as rubber.

h is a base of insulating material secured to the fiangef in anysuitable manner, and is provided with a metal ring let on its under sideto which the contact pin 12 is soldered which makes connection with oneof the filament wires 1'; and 15 is a metal plate in the center of thering soldered to the contact pin 13 which makes contact with the otherfilament wire 2'. By means of these contacts 14. and 15 the filament isconnected to the usual socket which is provided with the terminals of asupply main and a switch.

Fig. 4 illustrates the method of constructing or assembling the lamp. Arepresents a receiver, provided with an opening 0 at one end, throughwhich a lamp bulb, a, is inserted. p and r are supports for the bulb bywhich it is held in alignment. j is a stopper for the opening 0 providedwith an air tight gland 70 through which passes a rod or piston Z havingupon its inner end an enlargement or disk y just inside of which uponboth sides of the piston Z are studs m, m, to which are pivoted the jawsn, n, between the outer ends of which plays the double cam 0, pivoted tothe piston Z. s is a clamp to hold the stopper 3' when it is in positionto close the opening 0. as is a pipe provided with a cock w to admit airto.

the receiver A; and t is a pipe provided with a cock at which isconnected with an air exhausting apparatus. Not shown.

The method of constructing a lamp is as follows: A bulb a is placed inthe receiver, as shown. The base of a plug or stopper-B is placedagainst the disk y and between the jaws am, and secured by the earn 0.The piston with the plug B is passed into the receiver so that thefilament enters the bulb; The stopper j is secured to the receiverbefore 6 reaches the cylindrical opening I), when the cock to is closedto prevent air from coming in, and the cock u is opened to allow the airin the receiver to be exhausted. When the air is exhausted from thereceiver and also from the bulb a, the piston is gently forced inwarduntil the elastic ring 9 touches the annulus seat or end 3 of the bulb.The cock u is now closed, and the cock to opened and air admitted to thereceiver, and as its pressure is felt upon the base or flange f it isforced hard against the bulb hermetically sealing the plug to the bulb,the interior of the latter remaining a vacuum.

I claim 1. The herein described method of making incandescent lampswhich consists in placing wholly within a receiver upon suitablesupports a glass bulb open at its lower end, and then inserting into thesaid receiver a plug consisting of a filament and its support the baseof which is encircled with elastic material, then closing the receiverand exhausting the air therefrom, and then forcing the plug into theglass bulb, as set forth.

2. The herein described method of making incandescent lamps whichconsists in placing wholly within a receiver upon suitable supports aglass bulb open at its lower end, and then inserting into the saidreceiver a plug consisting of a filament and its support the base ofwhich .is encircled with elastic material, then closing the receiver andexhausting the air therefrom, and forcing the plug into the glass bulb,and then admitting airinto the receiver, as set forth.

3. The herein described stopper incandescent lamp, consisting of a glassbulb provided with a straight cylindrical opening and an annular seat atits lower end; and a hollow plug to which the filament is securedprovided with a stopper to fit the cylindrical opening of the bulb andwith a base or flange having upon its upper face a ring of elasticmaterial, the said flange having lugs extending from the opposite sidesof its inner circumference upon which the filament wires are wound.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, this 7th day of November, 1894:.

ROBERT GREER.

Witnesses:

JOSEPH A. GATELY, Geo. WILLIS PIERoE.

